A/T - A343F, `R' to `P/N' Chatter Improvement

TRANSMISSION & CLUTCH
TC001-98

FEBRUARY 13, 1998

TITLE:
A343F "R" TO "P/N" CHATTER

MODELS:
'97 - '98 LX 450






Introduction
Some 1997-1998 LX 450s with A343F automatic transmission may produce a chatter noise when shifted from Reverse into either Neutral or Park. To prevent this noise, a check ball has been added to the valve body as indicated in the illustration as shown.

Affected Vehicles
1997-1998 model year LX 450 with A343F automatic transmission serial numbers from 97H*-O00O1 through 97K*-99999.

Parts Information
OLD PART NUMBER NEW PART NUMBER PART NAME

35495-22020 Same Ball, Check, No.1
35433-30064 Same Valve Body Gasket No.1
35434-30076 Same Valve Body Gasket No.2






Warranty Information

Applicable Warranty:
This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for 72 months or 70,000 miles, whichever occurs first, from the vehicle's in service date.

Repair Procedure

1. Disassembly:
A. Remove valve body as described in the Repair Manual for the vehicle being serviced.
B. Turn over and remove 25 bolts.






C. Lift off upper valve body and plate as a single unit holding the valve body plate to the upper valve body as shown in the illustration.

Caution: Be careful that the check balls and strainer do not fall out.

2. Modification:
A. Turn over the upper valve body, remove plate & gaskets.






B. Add new check ball in the location shown in illustration.

3. Assembly:
A. Reassemble upper and lower valve body halves using new gaskets.
B. Install 25 bolts to upper valve body.

Torque: 56 in.lbs. (6.4 Nm, 65 kgf/cm)






Caution: Be Careful to reinstall the bolts in their proper locations as shown in the illustration.

Bolt Lengths:
A: 38 mm (1.50")
B: 20 mm (0.79")
C: 28 mm (1.10")

C. Complete reassembly as described in the Repair Manual for the vehicle being serviced.